WNV board that they came on were made at least 20,000 as far as I know as that is Cherry MOQ for custom board according to Cherry reps I have talked with. Not sure why they are such a pita to find now, wasn't too hard to get one for around $180 last year which I missed out on. I wouldn't pay a lot for the esc alone ($45?), but would pay a good price for the complete WNV board as it is quite nice and has good features.